Abstract:

To explore the connection performance between the hot melt nut inserts and plastics， the connection method of hot melt nut inserts was reasonably applied for 3D⁃printed plastic shells. This paper analyzed the influence of insert type， hot⁃melt temperature， and hole diameter on the connection performance of the hot⁃melt nut insert and plastics through a single⁃factor test， optimized the embedding parameters by the Taguchi methods， obtained the optimal combination of embedding parameters， and completed the practical application verification of the hot⁃melt nut inserts in a 3D⁃printed electronic product shell. The results indicated that the shape of the insert affected its connection performance with plastics. The order of anti pull⁃out performance of various inserts is as follows： twill > mesh > straight， and the order of their anti⁃torsion performance is as follows： twill > straight > mesh. The connection performance between the insert and the plastics increased with an increase in the hot melt temperature ranging from 180 to 220 ℃. Meanwhile， the connection performance between the insert and the plastics increased with a decrease in the hole diameter ranging from 6.0 to 5.8 mm. The order of the influence level of embedding parameters on the connection performance between the insert and plastics is as follows： insert type > hole diameter > hot melt temperature. The optimized embedding parameters were determined to be an insert type of twill， a hole diameter of 5.8 mm， and a hot melt temperature of 220 ℃. Under this parameter combination， the maximum pulling force of the hot melt nut insert was 1.22 kN， and the maximum torque was 3.04 N·m， achieving the best connection performance between the insert and plastics.

Key words: hot melt nut insert, 3D printing, plastic shell, connection performance